Database Design Using Normalization MCQs

Question 1

Normalization ________ data duplication.

Accepted Answer

eliminates

Answer

reduces

Answer

increases

Answer

maximizes

Question 2

Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?

Accepted Answer

Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.

Answer

Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

Answer

Three rows have the values Brown, NULL, and Blue in the same column.

Answer

One row has the value "He is interested in a Silver Porsche from the years 1978-1988" in a column.

Question 3

When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.

Accepted Answer

False

Answer

True

Question 4

Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.

Accepted Answer

True

Answer

False

Question 5

When building a database from an existing set of tables, we still need to consider normalization principles.

Accepted Answer

True

Answer

False

Question 6

We have normalized a table into BCNF if all candidate keys are determinants.

Accepted Answer

False

Answer

True

Question 7

We use the SQL construct COLUMNS(*) to determine the number and type of columns in a table.

Accepted Answer

False

Answer

True

Question 8

One common design problem when designing a database from existing data is the use of a single cell in one column to store multiple values of an attribute.

Accepted Answer

False

Answer

True

Question 9

In all cases, normalization into BCNF is desirable.

Accepted Answer

False

Answer

True